NEW YORK (AP) — If in the beginning there was male and female, fish seem to have forgotten the memo. For nearly 500 fish species, including the clownfish in “Finding Nemo,” the great divide between ...

University of Otago – Ōtākou Whakaihu Waka scientists have discovered that it takes mere minutes for a species of sex-changing fish to develop dominant behaviour after a change in the pecking order.

Mandarin fish (Siniperca chuatsi) is an economically important fish in China, with the females grow ingfaster than males. Thus, it is critical to obtain neo-male individuals for breeding all-female ...